56-2 / Y. Kim
IMID 2009 DIGEST •
Improved Performance in Polymer/Polymer Solar Cells
Youngkyoo Kim
Organic Nanoelectronics Laboratory, Department of Chemical Engineering, Kyungpook
National University, Daegu 702-701, Republic of Korea
Phone:+82-53-950-5616, E-mail:[email protected]
Abstract
Here the improved performance of polymer/polymer solar cells, which are of importance to achieve real plastic solar cells in the near future, is reported. First, the progress in polymer/polymer solar cells is briefly reviewed and then the limiting factors are discussed in terms of charge transport.
1. Objectives and Background
Recently organic solar cells have attracted keen interest due to their potential for solar energy conversion to electricity. Their power conversion efficiency has reached up to 4~6 % which is slightly varied depending on the measurement conditions. Of various types of organic solar cells, small molecule based cells have a disadvantage of high cost because they should be fabricated inside vacuum chambers if robust wet-processable small molecules are not invented. Hence, to date, the most popular system is a mix of polymers and small molecules. However, when it comes to the long reliability of solar cells, the small molecular components are considered to negatively affect the lifetime of solar cells. In this regard, polymer/polymer solar cells are rising to achieve real plastic solar cells. However, the efficiency of polymer/polymer solar cells still lags behind that of other type cells.
2. Results
In this presentation the progress of polymer/polymer solar cells is discussed with showing core results by leading research groups: The factors limiting the power conversion efficiency of polymer/polymer solar cells are explained. Recently we found that the efficiency was greatly improved by enhancing the electron mobility of electron-accepting polymers. The correlation between charge carrier mobility and solar cell efficiency will be discussed with the experimental results.
3. Impact
The present finding will contribute to improve the efficiency of polymer/polymer solar cells.
4. Acknowledgements
This work was supported by the Korea government projects (KOSEF-R01-2007-000-10836-0, KRF-2007-331-D00121, KOSEF-2009-0072777).
5. References
[1] Y. Kim, S. Cook, S. A. Choulis, J. Nelson, J. R. Durrant, and D. D. C. Bradley, Chem. Mater., 16, 4812 (2004).
[2] Y. Kim, S. A. Choulis, J. Nelson, D. D. C. Bradley, S. Cook, and J. R. Durrant, Appl. Phys.
Lett., 86, 063502 (2005).
[3] Y. Kim, S. Cook, S. M. Tuladhar, S. A. Choulis, J. Nelson, J. R. Durrant, D. D. C. Bradley, M. Giles, I. McCulloch, C-S. Ha, and M. Ree, Nature
Mater., 5, 197 (2006).
[4] M. Campoy-Quiles, T. Ferenczi, T. Agostinelli, P. G. Etchegoin, Y. Kim, T. D. Anthopoulos, P. N. Stavrinou, D. D. C. Bradley, and J. Nelson,
Nature Mater., 7, 158 (2008).
[5] Y. Kim, A. Ballantyne, J. Nelson, and D. D. C. Bradley, Org. Electron., 10, 205 (2009).
